Passive Probes. Bandwidth: 1MHz; Maximum continuous current 50Arms; Peak current 140A; Switching ratio: 500mV/A; 50mV/A; DC measurement measurement accuracy: 500mV/A (20mA-14ApK) ±3%±20mA; 50mV/A (200mA-100ApK )±4%± 200mA; 50mV/A (100A-140ApK)±15% max; 9V battery-powered. CP4000 Series probes adopt electromagnetic induction technology, to measure AC / DC current . They can measure from dozens of mA apeak to 200A, with the advantages of low phase . Besides, they can guarantee the accurate measurement of power voltage output (mV) effectively, Furthermore, they can measure cables, and be used in narrow spaces, because of the a narrow clamp design.